Air preheater

Abstract

The invention relates to an air preheater. The air preheater comprises a convection vertical shaft, wherein the convection vertical shaft comprises a vertical sleeve shell; the two ends of the sleeve shell are respectively connected with sealing plates in a sealing manner; a plurality of vertical heat exchange pipes are arranged in the sleeve shell at intervals; the two ends of each heat exchange pipe respectively penetrate through the sealing plates at the corresponding ends; the two ends of the sleeve shell are respectively connected with flue gas pipelines in an extending manner; the flue gas pipelines are communicated with the heat exchange pipes; the side wall of the sleeve shell is communicated with two air pipelines; a steel ball scattering device is arranged right above a heat exchange surface; steel balls are adopted for performing free-fall vibration ash removal; after the ash removal is finished, the steel balls and the ash fall into a collecting bin; the collecting bin is connected with a pipeline leading to a dust ball separating device; the dust ball separating device is connected to a steel ball bin at the bottom and then is fed into the pipe again by a steel ball circulating driving device, so that the circulation is finished, the online self-ash removal is realized, and the furnace shutdown for ash removal is not needed; and due to the special structure of the heat exchange pipes, an auxiliary ash removing device and a drying process are not needed, the process is simple and the heat transfer efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of an air preheater with a dust removal device, and in particular relates to an air preheater. Background technique [0002] The air preheater uses waste heat flue gas to heat the air, transfers the heat carried in the flue gas discharged from the flue at the tail of the boiler to the air before entering the boiler through the heat exchange tube, and preheats the air to a certain temperature. A device for improving the heat exchange performance of a boiler and reducing energy consumption. However, the dust content in the flue gas is large, and it is easy to adhere to the heat exchange tube, resulting in a significant reduction in the heat exchange efficiency of the heat exchange surface, which seriously affects the recovery and utilization of waste heat from the flue gas. At present, the dust removal methods of the air preheater mainly include: mechanical vibration dust removal, mechanical brush dust remova...

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Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide an air preheater, which can avoid the problem of poor cleaning effect of the heat exchange tubes caused by the poor arrangement of the internal heat exchange structure of the air preheater, and improve the efficiency of heat transfer. Thermal efficiency can also avoid complex additional measures to ensure cleaning efficiency

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